Circuit - 9v Battery Voltage Monitor - Circuits designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, December 01, 2011 06:46 AM

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More Battery Monitor Circuits

9v Battery Voltage Monitor

This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.2 volts. It uses a LTC1440 comparator, which also contains a 1.18v reference diode. In standby mode, the circuit draws only 4uA.

Click on Drawing Below to view PDF version of Schematic